Cuff unit and sphygmomanometer

Abstract

A cuff unit of the present invention includes a first wall and a second wall that face each other with an object which has a rod shape interposed therebetween, an actuator that is capable of moving the first wall and the second wall in parallel with each other in a direction in which the first wall and the second wall relatively approach each other or separate from each other, a pressing fluid bag that is provided on a surface of the first wall on a side facing the object and that receives supply of a fluid from outside to inflate and press the object, and a restraining fluid bag that is provided on a surface of the second wall on a side facing the object and that receives supply of a fluid from outside to inflate along the periphery of the object.

The invention claimed is: 
     
       1. A cuff unit configured to restrain and press an object that has a rod shape, the cuff unit comprising:
 a first wall and a second wall that each have a flat plate shape, are separated from and face to each other, and are arranged to receive the object having the rod shape between the first wall and the second wall when the cuff unit is used, the second wall being translationally movable in a first direction in which the second wall relatively approaches to the first wall or separates from the first wall; 
 a pressing fluid bag that is provided on a surface of the first wall on a side facing the object and that receives supply of a fluid from outside to inflate and press the object; 
 a restraining fluid bag that is provided on a surface of the second wall on a side facing the object and that receives supply of a fluid from outside to inflate along a periphery of the object; 
 a third wall that has a flat plate shape, is separated from and faces a surface of the second wall on a side opposite to the first wall; 
 a support wall that extends in the first direction in a manner separated from the second wall and integrally connects sides of the first wall and the third wall which face to each other, the first wall, the third wall and the support wall constituting an integral outer frame of the cuff unit; and 
 an actuator fluid bag that is provided between the second wall and the third wall and that receives supply of a fluid from outside to expand; and 
 a pressurizing pump that supplies the fluid to the actuator fluid bag to expand, and an exhaust valve that discharges the fluid from the actuator fluid bag to contract, such that the second wall moves translationally in the first direction between the first wall and the third wall. 
 
     
     
       2. The cuff unit according to  claim 1 , further comprising a rod member that extends from part of the first wall toward the second wall in the first direction perpendicular to the first wall,
 wherein the actuator fluid bag expands or contracts to move the second wall translationally along the rod member. 
 
     
     
       3. The cuff unit according to  claim 1 , further comprising a lock mechanism that is capable of fixing a relative position of the second wall with respect to the first wall in the first direction. 
     
     
       4. The cuff unit according to  claim 3 , wherein
 the second wall has a through hole that penetrates the second wall in the first direction, and 
 the lock mechanism includes
 an uneven first engaging portion that is formed on an edge portion of the through hole of the second wall, and 
 a plate member that is disposed to face the edge portion of the through hole of the second wall and whose position with respect to the first wall in the first direction is fixed, the plate member having an uneven second engaging portion that is disposed on a surface facing the edge portion of the through hole of the second wall, and 
 a locking fluid bag that receives supply of a fluid from outside to expand and urges the plate member toward the edge portion of the second wall such that the second engaging portion meshes with the first engaging portion. 
 
 
     
     
       5. A sphygmomanometer comprising:
 the cuff unit according to  claim 1 ; and 
 a pressure sensor that detects pressure of the pressing fluid bag.